CN104162808A - Method for detecting swing angle accuracy of numerical control milling machine - Google Patents

Abstract

The invention provides a method for detecting the swing angle accuracy of a numerical control milling machine. The method aims to solve the problems that according to a method for detecting the swing angle positioning accuracy of five-axis numerical control equipment in the prior art, a special detection tool is needed, the detection tool is expensive and normal exertion of the functions of the five-axis numerical control equipment is seriously influenced. In the method, a standard mandrel and a dial indicator are adopted to detect the swing angle accuracy of the numerical control milling machine, the normal tool lifting function of a tool bit of the numerical control milling machine is utilized to measure the horizontal offset delta x of the axis of the standard mandrel, and the error value delta alpha between the actual detected swing angle and a theoretical swing angle for detecting the swing angle accuracy of the numerical control milling machine is calculated according to the horizontal offset delta x. The method for detecting the swing angle accuracy of the numerical control milling machine has the advantages that the expensive detection tool or software is not needed, detection and compensation are simple and reliable, and normal exertion of the functions of the five-axis numerical control equipment can be effectively guaranteed.

Description

CNC milling machine pivot angle accuracy checking method

Technical field

The present invention relates to a kind of five number of coordinates control milling machine pivot angle accuracy detection technology, specially refer to a kind of CNC milling machine pivot angle accuracy checking method.

Background technology

Along with the structure of processing parts in machine industry becomes increasingly complex, its part processing precision and surface quality require more and more higher, and the application of five number of coordinates control milling machines is also more and more extensive.And application level and the precision of raising five number of coordinates control milling machines are the prerequisites that improve part production efficiency and quality.Pivot angle positioning precision is the most important precision of five number of coordinates control milling machines, and the precision that improve five number of coordinates control milling machines must ensure that pivot angle has higher precision.So-called pivot angle refers to the rotating shaft of five jig mills, and common is the A axle rotating around X-axis, around the B axle of Y-axis rotation, and around the C axle of Z axis rotation,

Conventionally, adopt the position feedback components and parts as closed-loop control such as high-precision encoder, circle grating, the pivot angle positioning precision of five coordinate numerical control devices is detected, once carry out after one-time positioning error detection and compensation, generally can not change again.But, changing detection and the compensation that after position feedback components and parts, just must carry out pivot angle positioning precision.In addition, adopt five coordinate numerical control devices of half-closed loop control, its pivot angle is due to the wearing and tearing that occur in using, and the decay that will inevitably bring pivot angle positioning precision, must regularly check its pivot angle positioning precision.Expensive due to testing tools such as high-precision encoder, circle grating and swing angle testers, conventionally be only provided in high-end import equipment, many numerical control device applying units do not possess the condition that pivot angle positioning precision detects, have a strong impact on the result of use of five coordinate numerical control devices, and functions of the equipments are normally brought into play.Obviously, the detection method of prior art five coordinate numerical control device pivot angle positioning precisions exists needs special detection tool, testing tool expensive and have a strong impact on the problems such as the normal performance of five coordinate numerical control functions of the equipments.

Summary of the invention

Need special detection tool, testing tool expensive and have a strong impact on the problem such as normal performance of five coordinate numerical control functions of the equipments for what solve that the detection method of prior art five coordinate numerical control device pivot angle positioning precisions exists, the present invention proposes a kind of CNC milling machine pivot angle accuracy checking method.CNC milling machine pivot angle accuracy checking method of the present invention adopts standard plug and amesdial to detect CNC milling machine pivot angle precision, utilize the horizontal offset Δ x of the normal direction cutter lifting functional examination standard plug axis of CNC milling machine cutter head, then calculate the error amount Δ α between CNC milling machine pivot angle precision actual detection pivot angle and theoretical pivot angle according to following formula;

$\mathrm{\Δ\α}=\mathrm{\α}-\mathrm{arctg}\left[\frac{\mathrm{tg\α}-\mathrm{\Δx}}{d\×\cos \mathrm{\α}}\right]$

In formula, Δ x is the horizontal offset of standard plug axis, and unit is mm; Δ α is the error amount between CNC milling machine pivot angle precision actual detection pivot angle and theoretical pivot angle, and unit is degree; α is pivot angle theoretical value, and unit is degree; D is the normal direction amount of movement of standard plug, i.e. the amount of movement of CNC milling machine cutter head normal direction cutter lifting, and unit is mm.

Further, CNC milling machine pivot angle accuracy checking method of the present invention, comprises the following steps:

(1) pack standard plug into CNC milling machine main shaft, pack CNC milling machine cutter head into;

(2) carry out instruction and CNC milling machine main axle moving is arrived to the angle that needs measurement;

(3), along the fixing amesdial of Y direction, ensure that indicator points to Y-axis forward;

(4) use handheld unit mobile machine tool, make standard plug near-end be pressed onto amesdial, find plug peak, and to adjust amesdial decrement be about 0.1mm, and by indicator to zero;

(5) performing a programme, makes CNC milling machine realize normal direction cutter lifting, and cutter head upwards moves along standard plug direction vector, and its amount of movement is d;

(6) record amesdial variable quantity, wherein, when amesdial pressure table Δ x be designated as on the occasion of, when table in pine,, Δ x was designated as negative value;

(7) repeated execution of steps (2) is to (6), until complete all detections that need the angle of measuring;

(8) utilize following formula to calculate the error amount Δ α between each actual detection pivot angle and theoretical pivot angle taking measurement of an angle,

$\mathrm{\Δ\α}=\mathrm{\α}-\mathrm{arctg}\left[\frac{\mathrm{tg\α}-\mathrm{\Δx}}{d\×\cos \mathrm{\α}}\right]$

In formula, Δ x is the horizontal offset of standard plug axis, and unit is mm; Δ α is the error amount between CNC milling machine pivot angle precision actual detection pivot angle and theoretical pivot angle, and unit is degree; α is pivot angle theoretical value, and unit is degree; D is the normal direction amount of movement of standard plug, i.e. the amount of movement of CNC milling machine cutter head normal direction cutter lifting, and unit is mm;

(9) according to the pivot angle error amount Δ α calculating, amendment pivot angle positioning precision compensation file, amendment parameter, reactivates compensation file;

(10) repeating step (2), to (6), takes measurement of an angle and checks checking all needs.

The useful technique effect of CNC milling machine pivot angle accuracy checking method of the present invention is not need to buy expensive testing tool and software, and detection and compensation work are simple, reliable, can effectively ensure the normal performance of five coordinate numerical control functions of the equipments.

Brief description of the drawings

Accompanying drawing 1 is the scheme of installation of CNC milling machine pivot angle accuracy checking method standard plug of the present invention and amesdial;

Accompanying drawing 2 is schematic diagrames of CNC milling machine pivot angle accuracy checking method pivot angle error amount Δ α of the present invention and horizontal offset Δ x.

Below in conjunction with the drawings and specific embodiments, CNC milling machine pivot angle accuracy checking method of the present invention is further described.

Detailed description of the invention

Accompanying drawing 1 is the scheme of installation of CNC milling machine pivot angle accuracy checking method standard plug of the present invention and amesdial, accompanying drawing 2 is schematic diagrames of CNC milling machine pivot angle accuracy checking method pivot angle error amount Δ α of the present invention and horizontal offset Δ x, in figure, l is standard plug, 2 is amesdial, and 3 is main shaft of numerical control machine tool.As seen from the figure, CNC milling machine pivot angle accuracy checking method of the present invention adopts standard plug and amesdial to detect CNC milling machine pivot angle precision, utilize the horizontal offset Δ x of the normal direction cutter lifting functional examination standard plug axis of CNC milling machine cutter head, then calculate the error amount Δ α between CNC milling machine pivot angle precision actual detection pivot angle and theoretical pivot angle according to following formula;

$\mathrm{\Δ\α}=\mathrm{\α}-\mathrm{arctg}\left[\frac{\mathrm{tg\α}-\mathrm{\Δx}}{d\×\cos \mathrm{\α}}\right]$

In formula, Δ x is the horizontal offset of standard plug axis, and unit is mm; Δ α is the error amount between CNC milling machine pivot angle precision actual detection pivot angle and theoretical pivot angle, and unit is degree; α is pivot angle theoretical value, and unit is degree; D is the normal direction amount of movement of standard plug, i.e. the amount of movement of CNC milling machine cutter head normal direction cutter lifting, and unit is mm.

CNC milling machine pivot angle accuracy checking method of the present invention, comprises the following steps:

(1) pack standard plug into CNC milling machine main shaft, pack CNC milling machine cutter head into;

(2) carry out instruction and CNC milling machine main axle moving is arrived to the angle that needs measurement; In the present embodiment, 8 of p-60 ,-55 ,-50 ,-45 ,-40 ,-35 ,-30 and-25 degree etc. take measurement of an angle and monitor, and, from-25 degree, carry out one-time detection at interval of 5 degree, until-60 degree;

(3), along the fixing amesdial of Y direction, ensure that indicator points to Y-axis forward;

(4) use handheld unit mobile machine tool, make standard plug near-end be pressed onto amesdial, find plug peak, and to adjust amesdial decrement be about 0.1mm, and by indicator to zero;

(5) performing a programme, makes CNC milling machine realize normal direction cutter lifting, and cutter head upwards moves along standard plug direction vector, and its amount of movement is d; In the present embodiment, standard plug direction vector amount of movement d is 20mm;

(6) record amesdial variable quantity, unit is mm; Wherein, when amesdial pressure table Δ x be designated as on the occasion of, when table in pine,, Δ x was designated as negative value;

(7) repeated execution of steps (2) is to (6), until complete all detections that need the angle of measuring; In the present embodiment, 8 of p-60 ,-55 ,-50 ,-45 ,-40 ,-35 ,-30 and-25 degree etc. take measurement of an angle and monitor, and testing result sees the following form 1;

(8) utilize following formula to calculate the error amount Δ α between each actual detection pivot angle and theoretical pivot angle taking measurement of an angle,

$\mathrm{\Δ\α}=\mathrm{\α}-\mathrm{arctg}\left[\frac{\mathrm{tg\α}-\mathrm{\Δx}}{d\×\cos \mathrm{\α}}\right]$

In formula, in formula, Δ x is the horizontal offset of standard plug axis, and unit is mm; Δ α is the error amount between CNC milling machine pivot angle precision actual detection pivot angle and theoretical pivot angle, and unit is degree; α is pivot angle theoretical value, and unit is degree; D is the normal direction amount of movement of standard plug, i.e. the amount of movement of CNC milling machine cutter head normal direction cutter lifting, and unit is mm; In the present embodiment, 8 of p-60 ,-55 ,-50 ,-45 ,-40 ,-35 ,-30 and-25 degree etc. take measurement of an angle and detect and calculate, and result of calculation sees the following form 1;

Table 1: detection and the result of calculation of horizontal offset Δ x and pivot angle error amount Δ α

(9) according to the pivot angle error amount Δ α calculating, amendment pivot angle positioning precision compensation file, amendment parameter, reactivates compensation file;

(10) repeating step (2), to (6), takes measurement of an angle and checks checking all needs.

CNC milling machine pivot angle accuracy checking method of the present invention only needs standard plug and amesdial, all possesses this testing conditions at the production unit that has five coordinate numerical control devices, does not need to buy expensive high-end detecting instrument and software.Taking Reinshaw company as example, laser interferometer 200,000, adds angle of revolution tester 300,000, amounts to 500,000 yuan, the digital controlled rotary shaft angle of API company pendulum tester also needs 400,000 yuan.Therefore, save a large amount of production standing charges.In addition, CNC milling machine pivot angle accuracy checking method of the present invention neither needs special centering or adjustment, does not also need the auxiliary detection tool of special making, as long as the people of meeting operating numerical control equipment just can complete all testings, simply, directly and reliably.Have, CNC milling machine pivot angle accuracy checking method of the present invention detects and compensates Machine Tool Positioning Accuracy again, and for analyzing part quality reason, rapid adjustment lathe is very convenient quick.When carrying out when comprehensive positioning precision checks just selecting advanced high accuracy detecting instrument to detect to high precise equipment, both fully reduced costs like this, can meet again the demand of maintenance work.

Obviously, the useful technique effect of CNC milling machine pivot angle accuracy checking method of the present invention is not need to buy expensive testing tool and software, and detection and compensation work are simple, reliable, can effectively ensure the normal performance of five coordinate numerical control functions of the equipments.

Claims (2)

1. a CNC milling machine pivot angle accuracy checking method, it is characterized in that, employing standard plug and amesdial detect CNC milling machine pivot angle precision, utilize the horizontal offset Δ x of the normal direction cutter lifting functional examination standard plug axis of CNC milling machine cutter head, then calculate the error amount Δ α between CNC milling machine pivot angle precision actual detection pivot angle and theoretical pivot angle according to following formula;

$\mathrm{\Δ\α}=\mathrm{\α}-\mathrm{arctg}\left[\frac{\mathrm{tg\α}-\mathrm{\Δx}}{d\×\cos \mathrm{\α}}\right]$

In formula, Δ x is the horizontal offset of standard plug axis, and unit is mm; Δ α is the error amount between CNC milling machine pivot angle precision actual detection pivot angle and theoretical pivot angle, and unit is degree; α is pivot angle theoretical value, and unit is degree; D is the normal direction amount of movement of standard plug, i.e. the amount of movement of CNC milling machine cutter head normal direction cutter lifting, and unit is mm.

2. CNC milling machine pivot angle accuracy checking method according to claim 1, is characterized in that, the method comprises the following steps:

(1) pack standard plug into CNC milling machine main shaft, pack CNC milling machine cutter head into;

(2) carry out instruction and CNC milling machine main axle moving is arrived to the angle that needs measurement;

(3), along the fixing amesdial of Y direction, ensure that indicator points to Y-axis forward;

(4) use handheld unit mobile machine tool, make standard plug near-end be pressed onto amesdial, find plug peak, and to adjust amesdial decrement be about 0.1mm, and by indicator to zero;

(5) performing a programme, makes CNC milling machine realize normal direction cutter lifting, and cutter head upwards moves along standard plug direction vector, and its amount of movement is d;

(6) record amesdial variable quantity, wherein, when amesdial pressure table Δ x be designated as on the occasion of, when table in pine,, Δ x was designated as negative value;

(7) repeated execution of steps (2) is to (6), until complete all detections that need the angle of measuring;

(8) utilize following formula to calculate the error amount Δ α between each actual detection pivot angle and theoretical pivot angle taking measurement of an angle,

$\mathrm{\Δ\α}=\mathrm{\α}-\mathrm{arctg}\left[\frac{\mathrm{tg\α}-\mathrm{\Δx}}{d\×\cos \mathrm{\α}}\right]$

In formula, Δ x is the horizontal offset of standard plug axis, and unit is mm; Δ α is the error amount between CNC milling machine pivot angle precision actual detection pivot angle and theoretical pivot angle, and unit is degree; α is pivot angle theoretical value, and unit is degree; D is the normal direction amount of movement of standard plug, i.e. the amount of movement of CNC milling machine cutter head normal direction cutter lifting, and unit is mm;

(9) according to the pivot angle error amount Δ α calculating, amendment pivot angle positioning precision compensation file, amendment parameter, reactivates compensation file;

(10) repeating step (2), to (6), takes measurement of an angle and checks checking all needs.